Improvement in duplex pumping-engines



3 SheetsSheet 1.

GEE/BLAKE. DUPLEX PUMPING ENGINE. No. 185,888. Patented Jan. 2, 1877.

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DUPLEX PUMPING ENGINE. N 185,888, Patented Jan.2,1877.

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WITgESSES I {9 INVEJV'TUR ,By fli-torneyJ N. PETERS, FHOTO-LITHGGRAPHER,wnsr-lme'ron. u c

3 Sheets-Sheet 3.

G. F. BLAKE. DUPLEX PUMPING ENGINE.

Patented Jan.2, 1877.

f V/IZWESSES N PEIERS. PHOTO-LITHOGRAPHER. WASHINGTON. 0 c

UNITED STATES GEORGE F. BLAKE, OF BOSTON,

MASSACHUSETTS, ASSIGNOR TO GEORGE F. BLAKE MANUFACTURING COMPANY, OFSAME PLACE.

IMPROVEMENT IN DUPLEX PUMPING-ENGINES.

Specification forming part of Letters Patent No. 185,888, dated January2, 1877; application tiled May 17, 1876.

To all whom it may concern:

Be it known that I, GEORGE E. BLAKE, of Boston, in the State ofMassachusetts, have invented certain Improvements in DuplexPumping-Engines; and I do hereby declare the following to be a full andcorrect description of the same, reference being bad to the accompanyingdrawings, in which Figure 1 is a perspective view of my duplexpumping-engine. Fig. 2 is a vertical section of the main and auxiliary.cylinders and their connections. Fig. 3 is a sectional view on line 2 zof Fig. 2, looking upward. Fig. 4 is a top view of the main valve-seat.Fig. 5 is a perspective view of the movable seat and side valves. Fig. 6is an inverted view of the main valve.

The same letter marks the same part wherever it occurs in the drawings.

Where large quantities of water have to be continually raised orsupplied by pumping, as in the water-works of towns and cities, and inthe clearing of mines, it is usual to employ duplex pumps, which, by thealternation of their strokes, keep up a continuous flow of water throughthe pipes, thus obviating those destructive concussions and shocks,which would occur if a single pump only were employed.

The object of my invention is to provide a mode of relieving adifficulty which often occurs in the use of duplex pumping-enginesviz.,the stoppage of the entire water-suppl on account of an injury to one ofthe pumps or engines.

My improvements olfer the greatest possible security against anoccurrence of this kind, since where they are applied, while either pumpor either engine remains in working order, the supply of water cannot bewholly cut 0d.

The nature of my invention consists in the combination and arrangement,forjoint or separate action, of two pumping-engines, each capable ofworking as an independent engine, and the two, when coupled for jointoperation, being so arranged that each engine shall actuate its ownvalves, either separately or together with the valves governing themotive power of the other, so that the two engines shall operate inperfect unison when working together, and that either of them may bestopped for repairs without arresting the operation of the other.

Fig. l of the drawings represents two direct-acting pumping-engines,marked No. l and No. 2, each constructed mainly in accordance withpatents heretofore granted to me. Each engine has an auxiliary cylinder,A, in which reciprocates a piston or plunger, P, which operates the mainsteam-valve V. The inlet and exhaust of this cylinder A are controlledby valves operated by slide'rod b, operated by a lever, 1, receivingmotion from a tappet-rod, T, impelled by the piston ot' the maincylinder B, and by tappet-arm n, attached to the top of the cross-head Con the end of piston-rod R. A bracket, E, attached to head H of thecylinder B of engine No. 1, serves as a point of attachment for thefulcrum of lever r, and also affords a bearing for two rocker-shafts, SS. The opposite ends of these rocker-shafts are supported in bearings inbracket E, attached to the head H of the cylinder of No. 2. Rock-shaft Shas on one end an arm, at, attached by a link, L, to valverod b, andnear its other end an arm, 0, which receives vibrating motion from apin, 10 attached to the cross-head C of engine No. 2. It follows thatthe reciprocation ot' cross-head C imparts vibration to rock-shaft S,and thus operates, by means of rod 1), the valves which control themovements of engine No. 1. Rockshaft S has an arm, 61, attached by alink, L, to rod b and, near its other end, an arm, 0, which is vibratedby pin p, fixed in cross-head C of engine N o. 1. Thus the reciprocationof head C rocks shaft S, and operates the rod b, by which the valvescontrolling the movements of engine No. 2 are driven.

When the engines are coupled in this manner for joint operation, thetappet-bars T T are removed. The holes in which they work are covered bycaps screwed onto them, and the levers r r are disconnected, orthetappet-arms n i'b' I'GlllOVGd from theirrespective cross-heads.

When it is desired that one engine, as No. 1, should work its own valvesand move the valves of the opposite engine, No. 2, the link L isdisconnected from rock-shaft S. When that a rsmsss arrangement is made,engine No. 1 works its own valves by means of the tappet T and tappetarmn, operating lever r and rod b, and at the same time works the valves ofengine No. 2 by means of rock-shaft S, driven by pin 10. A conversearrangement enables engine No. 2 to work its own valves, and also thoseof No. 1.

When it is desired that each or either engine shall act independently,the links L and L are to be disconnected from the rockershafts S and S,respectively; or, if preferred, the levers O 0 may be disconnected fromthe pins 1) p and their respective cross-heads. In either case thetappet-rods T are again inserted and the tappet-arms it replaced.

The tappet-rod T passes through a gland, g, into the main cylinder B,(see Fig. 2,) and is driven out by the piston P as it approaches the endof its forward stroke.

The operation of the main and auxiliary valves does not differessentially from that described in my previous patents, and in anapplication of even date herewith for an improvement in steam-pumps.

Above the main cylinder is placed an auxiliary cylinder, A, in whichworks a plungerpiston, D, which is driven by steam, and works the main"alve V. This valve rests on the movable seat F, which slides upon thefixed valve-seat G. The cylinder A, in which plungerD works, takes steamand exhausts through ports and steamways controlled by the side valves JK, placed in lateral recesses in the movable seat F. These steamways areshown in dotted lines in Figs. 2 and 3.

In Fig. 3 cylinder A is shown taking steam through ports 0 p q t, andexhausting through ports u v 'w. The port 11 being nearer to the end ofcylinder A than port u, the steam between the two is trapped by reasonof port a being closed by the face of valve K. The reverse throw of thevalve produces a converse condition of the ports and steamways, thecylinder A taking steam through ports '0 u a b, and exhausting throughports tw, the plunger cushioning on steam trapped between ports 17 and bby valve K closing port 0.

The main valve V controls the ports in the.

movable and fixed valve-seats F and G, so that the main cylinder Bshall, in the position shown in Fig. 2, take steam through ports I; h h8 s exhaust-portsj j m a l i, and the pist-on at either end of itsstroke cushion on steam trapped between ports h and s, or j and u, byreason of ports s u being alternately covered by the plain surface ofvalve V.

The only part of this valve mechanism which is not shown in my previouspatents is that for controlling the inlet and exhaust of theplunger-piston D.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

1. The combination and arrangement for joint or separate action of twopumping-engines, each being capable, by means substantially, as shown,of working as an independent engine, and, when coupled, either enginebeing capable of operating its own valves and those of the engine towhich it is joined, substantially in the manner and for the purposedescribed.

2. In combination with two pumping-en gines, each capable of independentaction, the coupling mechanism consisting of the pins 1) p levers O 0,rocker-shafts S S, arms (1 d,

links L L, and valve-rods b b, all constructed,

arranged, and operating substantially in the manner specified.

3. In combination with the movable valveseat F, the side valves J and K,and the system of ports controlled by them, to operate the piston D ofthe auxiliary engine, all constructed and arranged substantially as setforth.

The above specification of my said invention signed and witnessed, atWashington, this 15th day of May, A. D. 1876.

HARRY KING, Gms. F. STANSBURY.

